Hi Mattheus,
this seems to be some problem in excel rules editor. Make sure you are using latest version of Jedox.If the problem persists you should report the issue and how to reproduce it step by step.If you are able to type the rule formula [] = palo.marker("","",...) and you type it into Rule texbox without using comboboxes with rule fragments and press OK button you should avoid the parsing of the rule in excel integration. BTW: you should use markers only if you have performance problems with rules. It is not easy to use them right and concept of markers will become obsolete in next versions.
Jiri